Improvement in projectiles for rifled ordnance



ALLEN Gr. SINCLAIR, OF BROOKLYN, NEW YORK.

IMPROVEMENT lN PROJECTILES FOR RIFLED ORDNANCE.

Specification forming part of Letters Patent No.1 l9fi00,

dated April 14, 1874; application filed March 16, 1874.

To all whom it may concern:

Be it known that I, ALLEN G. SlNOLAIR, of the city of Brooklyn, in thecounty of Kings, in the State of New York, have invented an ImprovedProjectile for ltifled Ordnance, of which the following is aspecification:

My invention relates to an improved mode of forming and attaching thecircular band or ring containing the gas-aperture for lateral expansioninto the grooves of the cannon in consequence of the action of thepowder; also, to an improved mode of forming the gas-aperture forexpansion, so as, while preserving the full strength of the expandingportion of the circular band, to admit of a free escape of gas, and thusprevent high and injurious strains upon the walls of the gun, which arewell known to arise in the use of expanding projectiles using acontinuous circular slit or gasaperture for filling the grooves.Hitherto pernianently-attached circular expanding bands have been madeof single pieces cast onto the projectile, or attached to it by means ofkeys or screws, or have been screwed onto the iron or steel body, andhave been so applied as to be costly in manufacture, deficient instrength, in mode of securing, and in simplicity of construction ormanufacture; also, in this classof projectiles, as heretofore made, noprovision exists for a gas -escape to relieve abnormal pressuredeveloped in guns with their use, and causing the guns to rupture orinjuriously straining them, which detects, and the others abovementioned, it is the design of my invention to remove.

in the drawing, Figure 1, A represents a longitudinal section of a partof the body of the projectile; O, a section of the annular or continuousring applied to the base of the projectile; B, a cross-section of awrought-iron band, intended to keep the ring 0 in place, and is securedto the body of the projectile by bein g shrunk on, the body beingtapered, as shown in the drawing, to receive it. The wrought-iron bandhas a recess, F, and a corresponding lip, E, which acts to preventthegas from penetrating between it and the continuous band or ringshown insection at C. Fig. 2, A shows the base of the projectile. H H H Hrepresent metal screws to afford additional security to the wrought ironband B B B B. O O O 0 show the outer lip of the expanding ring, and D DD D are the openings between the annular expanding ring and itsfastening wrought-iron band B B B B, and into which openings thepowder-gases are injected and cause the expansion into the grooves ofthe soft-metal expanding base. G G G G are projectin g lugs from theouter lip of the expanding circular ring, separated by a fine cut, S S SS, from the corresponding part of the inner walls of the gas-apertures.These lugs form a base, so as to admit the application of the grooves NN N N to the continuous annular ring for the escape of the gas aroundthe projectile, and without too much weakening of the lips of the ringin the act of expansion, which would be the case if gas-escape grooves,of a size to be practically beneficial, were applied without these lugs,or their equivalent.

It is evident that as many lugs as may be required can be placed atdifferent points in the gas-aperture slit.

It is evident that if the outer or expanding lip were uniformlythickened to afford space for the gasescape grooves it could not performin a practical manner its function of expansion to take the grooves, onaccount of its great thickness.

It is evident that these lugs can be applied whether the annular bandapplied to the base of the projectile is either made of one or twopieces.

Having described my invention, what I claim as new, and desire to secureby Letters Patcut, is-

1. The circular or annular band C, in combination with the metal band B,applied to the base of a projectile, substantially as speci fied.

2. The inwardly 'irojecting lugs G G G G, cast with or otherwiseattached to the expanding lips G O O O substantially as and for thepurpose specifier.

ALLEN GA SINCLAIR.

Witnesses:

Bonn FROST, JOHN H. ROWLAND.

